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Charm degrees of freedom in hot matter from lattice QCD

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arxiv 2312.12857 v2 pith:AT5WAB3T submitted 2023-12-20 hep-lat

A.Bazavov , D. Bollweg , O. Kaczmarek , F. Karsch , S. Mukherjee , P. Petreczky , C. Schmidt , Sipaz Sharma This is my paper · ORCID
classification hep-lat
keywords charmdegreesfreedomcharmedchiralfluctuationslatticematter
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We study the nature of charm degrees of freedom in hot strong interaction matter by performing lattice QCD calculations of the second and fourth-order cumulants of charm fluctuations, and their correlations with net baryon number, electric charge and strangeness fluctuations. We show that below the chiral crossover temperature thermodynamics of charm can be very well understood in terms of charmed hadrons. Above the chiral transition charm quarks show up as new degrees of freedom contributing to the partial charm pressure. However, up to temperatures as high as 175 MeV charmed hadron-like excitations provide a significant contribution to the partial charm pressure.

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  1. In-medium bottomonium properties from lattice NRQCD calculations with extended meson operators

    hep-lat 2025-01 conditional novelty 6.0 of 10

    Bottomonium masses do not shift in the quark-gluon plasma up to 250 MeV, but thermal widths are nonzero and highly sensitive to the assumed spectral function shape.

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